Randomly searching the web, we found this patent for a combined hammer and wrench from 1902. What’s interesting about this particular design: The claw of the hammer doubles as the fixed jaw of the adjustable wrench. The inventor wanted a functional hammer — not just some tool with a flat striking surface, like many multi-tools that have come and gone.
Charles J. Maggard designed the wrench so it didn’t interfere with the hammer function, yet he also made the sliding jaw to be completely removable if you found it did interfere. Though there’s little information about the intended use of the wrench, he mentions that a variation on the design could feature teeth for fitting pipes.
We’re not sure if this tool was ever manufactured, or if it was just somebody’s million-dollar idea that never reached fruition, but it’s another fine example of American ingenuity. For some more interesting wrenches that actually were produced, click the Meeker’s antique wrench archive link at the bottom of the post.